Molding press



Patented Nov. 3, 1925.

UNITED STATES PATENTY OFFICE.

HENRY J'. KASCH, OF DAYTON, OHIO, ASSIGNOR TO THE KUBZ-KASCH COMPANY, OFDAYTON, OHIO, A CORPORATION 0F OHIO.

HOLDING rnnss.

Application led Hay 1,

To aZZ whom t may concern Be it known that I, lHENRY J. KAsoH, a citizenof the United States, residing at Dayton, in the county of Montgomeryand State of Ohio, have invented certain new and useful Improvements inIMolding Presses, of which theifollowing is a speciication. l

This invention relates to molding presses, and more particularly r`tothat type of press in which the plastic material is softened by heatbefore the pressing operation, and thereafter cooled to harden it afterthe molding operation has` been completed.

The rincipal object of my invention is to provide automatic means fordrawing the knock-out pin plate outwardly or downwardly to effect theejectinent of the finished product from the mold after the pressingoperation is finished. Up to the present time it has been necessary topry this plate down with a bar, which requires considerable time on thepart of the operator and injures the plate. My improved means for doingthis comprise pull-back plungers which become operable to pull down theplate when the platen starts its descent after the molding operation iscompleted.

It is another. object of my invention to construct the ram cylinder andpull-back cylinder on each side of the machine, from a single casting.

Other important and incidental objects will be brought out in thefollowing specii'ication and particularly set forth in the subjoinedclaims.

In the accompanying drawings, Figure 1 is a sectional, side elevation ofthe molding press with the die open. Figure 2 is a sectional, sideelevation of the same with the die closed. Figure 3 is a sideelevation-of the press. Figure 4 is a cross sectional view of the die,showing the pin bars, the knockout pins and the knock-out pin plate. And

Figure 5 is a top plan view, partly in section, of the ram and pull-backcylinder castings, and supply lines.

Throughout the' specification and drawings, similar reference charactersdenote corresponding parts.

Referrin to the accompan ing drawings for a detailed description o oneform of embodiment of my invention, the numeral 1 designates a edestalbase which supports a bed plate 2'. ounted upon the latter are 1222.Serial No. 557,537.

ltwo upright cylinder blocks 4, 4 that have been cast to provide widebase portions that .come to a taper at their inner ends. Projectingupwardly from the base portion of each block 4 is a ram cylinder 5 fromwhose wall there projects outwardly an upright wing portion 6 containingan elongated bore 7 y which receives a pull-back rod 8 having a plungerhead 9. The cylindrical portion 5 of each block 4 contains an elongatedbore 1Q to receive a reciprocating ram 11. By so castin each of theblocks 4.to provide a ram cy inder and a pull-back cylinder in it,economy of construction and eiciency in operation are obtained. (SeeFigures 1, 2 and 5.)

Mounted upon the rams 11, 11 is a platen 12 which supports a carrierblock 13 for a steam-plate 14 whose top portion is recessed as shown inFigure 4 to receive moldpin bars 15, 15. Projecting inwardly from thelatter are horizontal pins 15, 15 which engage the molded product fromthe side to assist in its ejection after the molding operation iscompleted. One type of product to which the press is particularlyadapted is a flangedtelephone receiver which, after being molded, thepins 15, 15a elevate when the mold-pin bars 15, 15 are engaged by theproduct-ejection means hereinafter to be described. Between the moldinbars 15, 15 impression bars 16, 16 are isposed, the lower one beingscrewed to the steam-plate 14 and the upper one being screwed to asteam-plate 17 that depends from a carrier block 18 secured to astationary platen or head 19. The latter has two laterally projectingwing or flange portions 20, 20 to which are bolted the` head parts oftwo downwardly depending push-back cylinders 21, 21 respectively.Projecting into the lower end of each one of these cylinders 21 lis apush-back plunger 22 whose lower end 2,1, 21 through riser pipes 24, 24respectively.

(See Fi res 1, 2, 3, 4 and 5.)

The uid for raising the rams 11,11 is K. delivered below them to thecylinderslO, 10y

'by branches 25, 25 of a pipe 26 towhichl iuid is admitted by athree-way valve 27 from a pipe 28 connected to a main supply line 29.(See Figure Also connected to the main supply line 1s a lateral pipe 30from which the two risers 24, 24 project and to which there are alsoconnected branch pipes 31, 31 that conduct the fluid to the top portionsof the pull-back cylinders 7, 7 respectively. (See Fi ures 1 and 5.)

The lower part o the carrier block 13 is groovedv to receive a slottedpin plate 32 in such a manner thatl the latter may have an independentvertical movement with respect .to the said carrier block. Eachpull-back .rod 8 projects upwardly through a bushing 33 in the top ofits respective cylinder 7 and through a hole in one side of the platen12, for connection to one side of the pin plate 32, whereby, when themolding operation is finished, the iiuid which enters the cylinder 7will exert its ypressure against the plunger-head 9 topull the pinyplate 32 downwardly.y (See Figures 1 and 2.)

Extending upwardly from, andfconnected to, the plate 32 isa series ofknock-out pins 34 which, when the downward movement of the dplaten 12 isarrested, will engage the mol pin bars ,15, 15vto knock the moldedVproduct loose from the die. When the moldpin bars 15, 15 are soengaged, the horizontal pins 15a, 15a elevate the molded product -bytheir firm grip upon it from the side,

thus assisting in its ejection from the die. The descent of the platen12 is arrested by the following means. AReferring to Figures 1 and 2,pins 35, one of which is shown in each of those figures, project'downwardly from the middle portion of the pin plate 32, through holesin the platen 12, for engagement with a slotted plate 36 mounted on thetop portions of the cylinder blocks 4, 4. When the lower ends of thepins strike this plate 36, the pin plate 32 will be held in a stationaryposition to cause the knock-out pins 34 to dislodge the molded articlesas the platen 12 continuesitsI downward movement. f

The upper portion of the carrierblock 18 is grooved like the carrierblock 13, to `receive a slotted pin plate 37 in such a manner that thelatter may have an independent vertical movement with respect to thecarrier block 18 and whose horizontal pins 15, 15a raise'thearticlesafter said bars are so engaged. Secured to each end of the plate 37 isthe upper end of a rod 38 which projects downwardly. through ahole inthe,

platen 12. Secured to the lower end of each rod 38 is a`A nut 39 whichthe platen 12, during its descent, is adapted to engage to pull .the pinplate 37 downwardly to the position shown in Figure 1 after the moldingoperation is completed for the purpose of dislodging any molded articlesthat may adhere to the top portion of the mold.

When the platen 12 again ascends,

plate 37 is pushed ipwardly by the engagevthe pin ,I

40, 40 on the rods 38, 38 Figure 2.) The molded articles which aredislodged from the mold parts by the pin plates 32 and 37, are removedby the gloved hands of the operator after the press is opened for thedischarge of them.

ln operation, when it Iis desired to raise the lower mold unit, thethree-way lvalve 27 is turned to admit fluid to the pipe 26, from whichit flows through the branch pipes 25, 25 to the cylinders elevate therams 11, 11 within them. These rams in turn raise the plate 32, at whichrial is inserted between the mold-pin bars l5, 15 and `the impressionbars 16, 16. 'The platen -12 and the members mounted `on them are thenraised to compress the plastic ma- 10, 10 respectively tol respectively.(See sol platen 12 to the pin point the plastic mate-V terial in thepresence of the heat of the steam platen 12 to reach the pin plate 32before i the die part which it carries can be lled with the plasticmaterial. f y

After the plastic material has been molded,the three-way valve 27 isturned to permit the Huid to How out of the cylinders 10, 10, whereuponthe platen 12 and the members carried by it are free to be pusheddownwardly by the push-back plungers 22, 22. When the platen 12 startslits descent, the pin plate 32 will be drawn downwardly by the ull-backrods 8, 8 until the pins 35 strike t e stationary plate 36d at whichtime the descent of the pin plate 32 will be arrested to cause theknock-out pins 34 which project upwardly therefrom, to dislod e themolded articles by engagement wit the mold-pin bars 15 between which thelatter articles have been formed. These molded articles will be readilydislodged by the pins 34 because of the fact that after the platen 12comes to the position where the downward movement of the pin plate 32 isarrested, it will continue its descenta sailicient distance to draw thelower impression bar 16 below the molded articles whose .downwardmovement is restrained by the hold the pin plate lirmly against theplaten l2 until the die part which it carries is filled 'p with plasticmaterial prior to another molding operation.

`I do not wish to be limited to the details of construction andarrangement herein shown and described, and any vchanges or modiicationsmay be made therein within the scope of the subjoined claims.

Having described my invention, I claim:

l. In a 4device of the type described, the combination with a base, of aplatenmow ably supported thereon, a lower mold-partcarried by saidplaten, an upper mold-part supported above the lower one, elevatingmeans for raising said platen to bring the lower mold-part intoenga-gement with the carried by said platen` an upper 'mold-partsupported above the lower one, means for raising said platen to bringthe lower moldpart. into engagement with the upper one, a knock-out pinplate adapted to be carried upwardly by said platen, and hydraulic meansfor pulling said knock-out pin plate downwardly when the platen startsits descent after the molding operation is completed.

3. In a device of the typeJ described, thc

combination with a base, of a platen movably supported thereon, a lowermold-part carried by said platen, an upper mold-part supported above thelower one, means forv raising said platen to bring the lower moldpartinto engagement with the upper one, a knock-outpin plate adaptedr to becarried upwardly by said platen, means for arresting the downwardmovement of lsaid pin plate before the platen reaches its lowermostposition, pull-back cylinders, and plungers in said cylinders forpulling the said plate downwardly to the arresting means when the platenstarts its descent after the molding operation is completed.

4. In a device of the type described, the' combination with a base, of acylinder casting mounted thereon, having a large bore and a small boretherein, a ram movable in the large bore, a platen supported by saidram, a lower mold-part carried by said platen, an 'upper mold-partmounted above the lower one, with' which the lower moldpart is adaptedto be carried into engagement by said platen, a knock-out pin plateadapted to be carried'upwardly by saidA pla-ten, and as plunger movablein the small bore in said cylinder casting for pulling said knock-outpin plate downwardly when the platen starts to descend after the moldingoperation is completed.

In testimony whereof I have hereunto set my hand this 28th day of April,1922.

HENRYy J. KAsoH.

